Amer def recon-h 30mm q.D.Scope mount 2" offset high FEATURES-Does not require proprietary tools for adjustment-Lever can be configured to lock to the front or rear-Maximum rail engagement-6061 T6 aluminum-Hard coat anodized finish-Fully adjustable-QD Auto Lock(TM) lever system Other Features: Qd auto lock lever system, made in the usa, features 2" offset for extended eye relief, designed for flat-top ar-15's high version, 1.93" top of rail to centerline of rings, ring size is 30mm